So I recently found this little incense box with brass inlay at a flea market in rough shape, it said “handmade in India” on it. So I thought “what the heck, I’ll buy it, undo the glue joints, sand it up, shellac it, and use it. After all, its made of east indian rosewood sides and the rest some obscure exotic”. Well, I’m getting close to finishing it and I was wondering what I could coat the inside of the box with to make removal of ash and residue easy, while also withstanding any heat that might be released from burning. Any Ideas?